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Table Of Contents
The Data Warehouse Toolkit - Third Edition
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After the ETL specification has been created, you typically focus on developing the ETL process for the one-time load of historic data. Occasionally, the same ETL code can perform both the initial historic load and ongoing incremental loads, but more often you build separate ETL processes for the historic and ongoing loads. The historic and incremental load processes have a lot in common, and depending on the ETL tool, significant functionality can be reused from one to the other.
In general, you start building the ETL system with the simplest dimension tables. After these dimension tables have been successfully built, you tackle the historic loads for dimensions with one or more columns managed as SCD type 2.
The easiest type of table to populate is a dimension table for which all attributes are managed as type 1 overwrites. With a type 1–only dimension...
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